<nb-select [selected]="currentTheme" (selectedChange)="changeTheme($event)" status="primary">
  <nb-option *ngFor="let theme of themes" [value]="theme.value" style="align-items: center;">
    <nb-icon icon="{{theme.icon}}"></nb-icon>
    <span style="margin-left: 0.5rem;">{{ theme.name }}</span>
  </nb-option>
</nb-select>
